goody-goodyˈgoody-ˌgoody noun (plural goody-goodies) (also ˌgoody-ˈtwo-shoes American English) [countable] 
someone who tries hard to be very good and helpful in order to please their parents, teachers etc – used especially by children to show disapproval
someone who tries hard to be very good and helpful in order to please their parents, teachers etc – used especially by children to show disapproval